MULTIPLEX Twinjet Owner's manual

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Bauanleitung

Building instructions

Notice de construction

Instruzioni di montaggio

Instrucciones de montaje

Best:Nr. 21 4072

TwinJet

Stand 04/2001

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Sicherheitshinweise

☺ Prüfen Sie vor jedem Start den festen Sitz des Motors und der Luftschrauben - insbesondere nach dem Transport, härteren

Landungen sowie Abstürzen. Prüfen Sie ebenfalls vor jedem Start den festen Sitz und die richtige Position der Tragflächen auf

dem Rumpf.

☺ Akku erst einstecken, wenn Ihr Sender eingeschaltet ist und Sie sicher sind, daß das Bedienelement für die Motorsteuerung auf

"AUS" steht.

☺ Im startbereiten Zustand nicht in den Bereich der Luftschraube greifen.

Vorsicht in der Luftschraubendrehebene - auch Zuschauer zur Seite bitten!

☺ Zwischen den Flügen die Motortemperatur durch vorsichtige Fingerprobe prüfen und

vor einem Neustart den Motor ausreichend abkühlen lassen. Die Temperatur ist richtig, wenn Sie den Motor problemlos berüh-

ren können. Insbesondere bei hohen Außentemperaturen kann dieses bis zu 15 Minuten dauern.

☺ Denken Sie immer daran: Niemals auf Personen und Tiere zufliegen.

Conseils de sécurité

☺ Avant chaque décollage, vérifiez la fixation du moteur et de l'hélice, notamment après le transport, après les atterrissages violents

et après un “Crash”. Vérifiez également, avant chaque décollage la fixation ainsi que le positionnement de l’aile par rapport au

fuselage.

☺ Ne branchez l’accu de propulsion que si vous êtes sûr que votre émetteur est allumé et que l’élément de commande moteur est

en position “ARRET”.

☺ Ne mettez pas vos doigts dans l’hélice! Attention à la mise en marche, demandez également aux spectateurs de reculer.

☺ Entre deux vols, vérifiez en posant un doigt dessus, la température du moteur, laissezle refroidir suffisamment avant le prochain

décollage. La température est correcte si vous pouvez maintenir votre doigt ou votre main sur le moteur. Le temps de

refroidissement peut varier jusqu’à 15 minutes s’il fait particulièrement chaud.

☺ Pensez-y toujours: ne volez jamais vers ou au-dessus des personnes ou des animaux.

Safety notes

☺ Before every flight check that the motor and propeller are in place and secure - especially after transporting the model, and after

hard landings and crashes. Check also that the wing is correctly located and firmly secured on the fuselage before each flight.

☺ Don’t plug in the battery until you have switched on the transmitter, and you are sure that the motor control on the transmitter

is set to “OFF”.

☺ When the model is switched on, ready to fly, take care not to touch the propeller. Keep well clear of the propeller disc too, and ask

spectators to stay back.

☺ Allow the motor to cool down after each flight. You can check this by carefully touching the motor case with your finger. The

temperature is correct when you can hold your finger on the case without any problem. On hot days this may take up to 15

minutes.

☺ Please keep in mind at all times: don’t fly towards people or animals.

Note di sicurezza

☺ Prima di ogni decollo controllare che il motore e la eliche siano fissati stabilmente - specialmente dopo il trasporto, atterraggi

duri e se il modello è precipitato. Controllare prima del decollo anche il fissaggio e la posizione corretta delle ali sulla fusoliera.

☺ Collegare la batteria solo quando la radio è inserita ed il comando del motore è sicuramente in posizione ”SPENTO”.

☺ Prima del decollo non avvicinarsi al campo di rotazione della eliche. Attenzione alla eliche in movimento - pregare che eventuali

spettatori si portino alla dovuta distanza di sicurezza!

☺ Tra un volo e l’altro controllare cautamente con le dita la temperatura del motore e farli raffreddare sufficientemente prima di

ogni nuovo decollo. La temperatura è giusta se si possono toccare senza problemi. Specialmente con una temperatura esterna

alta questo può durare fino a 15 minuti.

☺ Fare attenzione: Non volare mai nella direzione di persone ed animali.

Advertencias de seguridad

☺ Compruebe antes de cada despegue que el motor y la hélice estén fuertemente sujetados, sobretodo después de haberlo

transportado, de aterrizajes más fuertes así como después de una caída. Compruebe igualmente antes de cada despegue que las

alas estén bien sujetas y bien colocadas en el fuselaje.

☺ Conectar la batería, cuando la emisora esté encendida y Usted esté seguro que el elemento de mando para el motor esté en

”OFF”.

☺ No meter la mano en la zona inmediata a la hélice cuando el avión esté a punto de despegar. ¡Cuidado con la zona de la hélice!

¡Pedir a los espectadores que se aparten!

☺ Entre los vuelos hay que comprobar cuidadosamente la temperatura del motor con el dedo y dejar que el motor se enfríe antes

de volver a despegar. La temperatura es correcta, si puede tocar el motor sin problemas. Sobretodo en el caso de temperaturas

del ambiente muy altas, esto puede tardar unos 15 minutos.

☺ Recuerde: No volar nunca hacía personas o animales.

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Building instructions

Order No. 21 4072

1. Examine your kit carefully!

MULTIPLEX model kits are subject to constant quality checks throughout the production process, and we sincerely hope that

you are happy with the contents of your kit. However, we would ask you to check all the parts before you start construction,

as we cannot exchange components which you have already worked on. If you find any part is not acceptable for any

reason, we will readily correct or exchange it. Just send the component to our Model Department. Please be sure to include

a brief description of the fault.

We are constantly working on improving our models, and for this reason we must reserve the right to change the kit contents

in terms of shape or dimensions of parts, technology, materials and fittings, without prior notification. Please understand that

we cannot entertain claims against us if the kit contents do not agree in every respect with the instructions and the illustrations.

TwinJet

Caution!

Radio-controlled models, and especially model aircraft, are by no means playthings. Building and operating

them safely requires a certain level of technical competence and manual skill, together with discipline and a

responsible attitude at the flying field. Errors and carelessness in building and flying the model can result in

serious personal injury and damage to property. Since we, as manufacturers, have no control over the

construction, maintenance and operation of our products, we are obliged to take this opportunity to point

out these hazards, and to emphasise your personal responsibility.

Additional items required:

RC system components: Function

MULTIPLEX Micro 5/7 receiver 35 MHz Order No. 5 5933

40 MHz Order No. 3 5934

MULTIPLEX MS-X3 servo (2 required) Elevator / aileron Order No. 6 5035

PiCO-Control 400 DUO Speed control Order No. 7 5023

Flight battery:

MULTIPLEX 7/RC2000-2L HS flight battery Order No. 15 5529

More power

Installing two PERMAX 480 /7.2 V motors, # 33 2689, provides a significant increase in climb performance and airspeed. If you

use 480 motors an 8-cell flight battery is required.

Battery charger:

PiCO AUTO-charger for rapid-charging transmitter and flight packs Order No. 9 2526

Adhesive:

MULTIPLEX “Medium Zacki” Order No. 59 2720

MULTIPLEX “Zacki Activator” Order No. 59 2824

PATTEX Kraft contact cement, or similar (not in MPX range)

Tools:

Scissors, combination pliers, balsa knife, razor saw or hacksaw blade, screwdriver, small round file

Specification:

Wingspan 910 mm 35,8 inch

Fuselage length 802 mm 31,6 inch

All-up weight 400 motors / 7 cells approx. 1100 g 38,8 oz

All-up weight 480 motors / 8 cells approx. 1200 g 42,3 oz

Wing area approx. 25.5 dm² 395 sqinch

Wing loading min. approx. 43 g/ dm² 13,8 oz/sqinch

RC functions Aileron, elevator and motor

Separate the illustration pages from the centre of this booklet.

Optional national decal set

The following decal sheets are

available to help you differentiate

between examples of the model:

black / red / yellow # 72 4104

green / white / red # 72 4105

blue / white / red # 72 4106

red/white/red # 72 4103

UK # 72 4101

USA # 72 4100

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Important note

This model is not made of styrofoam!

It is not possible to glue the material using white glue

or epoxy. Please be sure to use the adhesives stated

in the instructions.

4. Installing the servos and motors.

The model is designed for MULTIPLEX MS-X3 servos. Each

servo lead has to be soldered directly to the servo extension

lead with separation filter # 8 5255. The extension leads are

prepared as follows:

Loop the servo extension lead through the ferrite ring eight

times; when you have finished, the distance from the ring to

the receiver should be 5 to 10 cm. Starting from inside the

fuselage, run the cable through the pierced hole in the

fuselage side in the direction of the servo well. Make a wire

hook, or re-shape a paper clip to help you pull the servo leads

through the foam. Solder the wires together, taking care to

maintain the colour coding, and insulate each joint with a

piece of heat-shrink sleeving. Now temporarily switch on the

RC system and centre the sticks and trims, so that you can be

sure that the servo output arms are at neutral.

Shrink a piece of heat-shrink sleeving round each servo, or

wrap the servos in tape.

The tape or sleeving prevents glue penetrating into the

servo case - and especially into the gears - when the servos

are glued in place.

Now apply “Zacki Activator” to the prepared servo, and allow

it to dry for a couple of minutes. Apply an adequate quantity

(but not too much) of “Medium Zacki” to the servo well, but

only in the area where the tape or sleeve round the servo will

make contact. Place the servo in the servo well, then run the

cable along the cable duct. If necessary, apply clear tape over

the top of the ducts to prevent the wires slipping out.

Locate the pre-formed pushrods 30 and connect the Z-bend

to the outermost hole in the servo output arm. At the elevon

end slide the pushrod through the pushrod connector and

secure it with the M3 socket-head grubscrew 27 using the

allen key 26; remember to set the elevon to neutral before

you tighten the screw.



Connecting the motors

In the same way, run the motor power leads through the cut-

away area of the battery cradle (liner shell) 10 to the motors,

starting from inside the fuselage, and route them along the

motor cable ducts. Fit the insulating sleeves 39 on the pins of

the 47 nF capacitors to guard against short-circuit, then solder

the capacitors across the motor terminals. Cut the power

cables to length, strip the insulation from the ends and solder

them to the motor terminals. As the motors are required to

operate in “pusher mode”, they must be connected with

reversed polarity to make them run backwards, i.e. red to black

(-), and black to red (+).



The Twin-Jet’s propellers 35 operate in pusher mode, so for

this application they have to be turned round inside the

spinner; i.e. the plain (non-inscribed) face of the propeller

should face the motor. Fix the propeller to the motor shaft

Assembling the model:

1. Attaching the fuselage nose, installing the fuselage liner

shell

Remove any rough edges from the moulded foam

compartments. The first step is to glue the fuselage nose 2 to

the main fuselage section 1: check that the parts fit together

snugly, then spray one side of the joint surface with ZACKI

activator. Allow it to dry for two minutes, then apply “Medium

Zacki” to the other surface, and push the parts together. Cut

out the vacuum-moulded liner shell 10 along the moulded-

in lines, and cut away the whole of the underside at the rear

end to allow the cables to pass through. Temporarily install

the liner shell, and fit the canopy 5 and the fuselage top

decking 6 to check that it is possible to close the hatches fully;

trim the liner shell as required. Glue the liner shell in place

using contact cement, using no more adhesive than is

necessary. Contact cement attacks the plastic of the liner shell,

and too much adhesive may distort and ruin it. Contact

cement is usually allowed to air-dry before joining the parts,

and this procedure is described in the printed instructions,

but for this joint just use it as a conventional glue. Tape the

parts together while the contact cement is drying. You may

need to pack out the liner shell from the inside to hold it in

position.



2. Preparing the wiring

The kit includes the power cables 37 used to connect the

electric motors 36. Using a small round file or a screwdriver,

push a hole through the fuselage sides to extend the cable

ducts in the wings, so that the motor and servo cables can be

passed through as shown in the drawings.



3. Releasing the elevons, installing the horns

For production reasons, and to prevent transit damage, both

elevons (control surfaces) are supplied still attached to the

wings. Cut through the elevon at the root end using a small

fine-bladed metal-cutting saw (for a clean cut). At the tip end

you can cut the elevon free using a sharp balsa knife. The

decal sheet strip designed to act as the aileron hinge has

proved to be less than ideal due to the special characteristics

of the ELAPOR foam used for this model. We recommend that

you use clear thin adhesive tape (e.g. diamond tape) instead.

Prepare the glue-fitting horns 32 for installation in both

elevons: fit the pushrod connector 33 in the outermost 2.5

mm Ø hole, and secure it with the washer 25 and nut 34.

Spray the horns with “Zacki Activator” and allow it to dry for a

while. Apply “Medium Zacki” to the horn recesses, and push

the horns into place. Allow the glue to set hard.

10

with a drop of 5-minute epoxy, or use a little UHU Endfest

300 (slow-setting epoxy) and leave it overnight to cure.

On no account use cyano! All you need to do is take a little

glue on a pin, apply it to the inside of the hole in the plastic

spinner, and then push the propeller onto the motor shaft.

Push the pin right through the spinner from the front to

prevent an air bubble forming in front of the motor shaft.



5. Installing the electric motors

The motors are simply glued in the motor pods by applying

a few drops of “Medium Zacki” to the motor can, and pushing

them into place; line up the motors with the edge of the upper

rounded side of the pods. It is not necessary to apply glue

over a large area of the motor; a few drops at the edges will

hold them securely, and they can then easily be cut out if a

fault develops. Fill any gaps at the joints with chopped cotton

strands.

6. Preparing the canopy

Cut a 35 mm long piece from the balsa strip 20, and glue it in

the rectangular recess in the canopy 5, using Zacki. Fit a screw-

hook 31 into the dowel 22, and glue the dowel in the circular

hole. When the model is prepared for flying, the canopy is

held in place by means of the rubber band 29.



7. Sealing the bottom of the fuselage

Arrange all the cables neatly inside the fuselage. The

moulding process produces an unwanted projection inside

the channel on the underside of the fuselage nose 2. This

should be removed using a sharp balsa knife. Cut the landing

skid (balsa strip) 20 to length and trim it to fit in the recess in

the fuselage. If you wish, you can seal the strip with a coat of

paint, or cover it with film. Spray the strip with “Zacki Activator”

before gluing it in place, and let it dry for a while. Apply

“Medium Zacki” to the fuselage channel - enough, but not

too much! - and push the strip into place.



8. Fitting the bottom screw-hooks

Locate the marked points in the vacuum-moulded liner shell

- one at the front, and one forward of the battery ramp - and

pierce or drill a hole about 1.5 mm Ø at both points. Fit the

screw-hooks through the holes in the liner shell and into the

wood strip 20. Apply a drop of Zacki to secure them.



9. Installing the fins

Check that the fins 3 + 4 are a close fit “dry”, i.e. without glue.

If the joint surfaces do not match the profile of the wing

perfectly, remove any rough edges and sand slightly to obtain

a good fit. Spray the joint surfaces with “Zacki Activator” and

allow it to dry. Apply “Medium Zacki” to the fin recesses in

the top surface of the wing, and push the fins into place. Check

alignment immediately, and tape them in place until the glue

has cured.

9. Final assembly

Glue strips of Velcro tape (hook side) 23 in the appropriate

positions on the inside of the fuselage liner shell, and attach

the loop side of the Velcro tape to the corresponding

components which are to be held in place.

The RC system and power system components should be

positioned as follows:

At the front, behind the rubber band which retains the canopy,

comes the receiver. The speed controller should be installed

between the receiver and the second screw-hook, which

retains the flight battery. The flight pack itself is fitted on

the angled ramp. The battery position can be varied slightly,

and its final location is determined when the model is

balanced. Extra security is provided for the battery by the

rubber band 28.

Final assembly - lateral location of the flight pack

When you have made the landing skid 20 (750 mm long) and

the cabin latch 21 (35 mm), cut the remainder of the strip

material into two pieces of roughly equal length. Position the

flight pack inside the inner fuselage and trim the two strips

to fit on both sides of the battery to provide lateral support.

Glue them to the inner fuselage as shown.

Run the receiver aerial through the pierced hole in the

fuselage side and along the channel in the wing. Secure it

with adhesive tape as shown in the drawing.

The next step is to test the working systems, and this

requires all the electrical connections to be completed.

Never connect the motors until you have

switched on the transmitter, and have checked

carefully that the motor control stick is at “OFF”.

Switch the transmitter on, and connect the flight battery in

the model to the speed controller, and the speed controller

to the receiver. It is essential that your controller should

feature what is known as a BEC circuit (receiver power supply

from the flight pack).

Switch the motors on briefly from the transmitter, and check

the direction of rotation of the propellers (when test-running

the motors hold the model really securely, and remove any

loose lightweight objects from the area behind the model.

Take care: even small motors and propellers represent an

injury hazard!

Once all the internal components are installed correctly, you

can glue the fuselage top decking 6 in place. Trim the decking

to fit “dry”, holding the canopy in place at the same time, and

trim the parts if necessary. Spray “Zacki Activator” on the top

decking, let it dry, then apply “Medium Zacki” to the fuselage

joint surfaces, and carefully fit the top decking in position.

11



11

10. Elevon travels

The travel of the elevons must be set correctly to achieve a

balanced control response. When elevator is applied (forward

/ back stick), both

elevons should rise by about 20 mm

when you pull the stick back, and fall by about 20

mm when you move the stick forward. Aileron travel

should be +/- 15 mm, i.e. there should be no

differential. Measure these travels at the widest point

of the elevons. If you cannot achieve these travels with your

radio control system, you will need to adjust the mechanical

linkages.

11. Balancing

The Twin-Jet, like any other aircraft, must be balanced at a

particular point in order to achieve stable flying

characteristics. Assemble your model, ready to fly, and install

the flight battery. You will find moulded-in marks on the

underside of the wing roots, close to the hand-grip recesses.

Support the model at this point on two fingertips, and it

should balance level. If it does not, you can move the flight

battery forward or aft to correct the balance point. Once the

correct position is found, mark the battery cradle inside the

model to ensure that the pack is always replaced in the same

position. The drive battery is provided with its own “safety

belt” in the form of a strong rubber band. Please be sure to fit

it before each flight, to avoid embarrassing accidents.

Be sure to fit the rubber band which holds the canopy in place

before you fly the model.

The marked CG produces a model which is safe and

comfortable to control when the elevons are at neutral. The

model should be launched with a powerful throw and the

nose angled up at about 10°, so that it has sufficient ground

clearance when picking up airspeed. Once it is up to speed,

the trims should be adjusted so that the model climbs gently

at full throttle. Depending on your personal flying style, you

may find that you have trimmed the elevons slightly down

when you land the model. However, please be sure to reset

them to neutral before the next flight.

12. Gilding the lily - applying a little decoration

The kit is supplied with a multi-colour decal sheet 16. Cut out

the individual name placards and emblems and apply them

to the model in the position shown in the kit box illustration,

or in an arrangement which you find pleasing. The cabin can

be coloured using a waterproof felt-tip pen, continuing the

colour down to the edge.

13. Preparing for the first flight

For the first flight wait for a day with as little breeze as possible.

The early evening is often a good time.

Be sure to carry out a range check before the first flight.

Just before the flight, charge up the transmitter battery and

the flight pack using the correct procedure. Ensure that “your”

channel is not already in use before you switch on the

transmitter.

Ask your assistant to walk away from the model, holding the

transmitter. The aerial should be fitted but completely

collapsed.

Your assistant should operate one of the functions constantly

while you watch the servos. The non-controlled servo should

stay motionless up to a range of about 80 m, and the

controlled one should follow the stick movements smoothly

and without any delay. Please note that this check can only

give reliable results if the radio band is clear of interference,

and if no other radio control transmitters are in use - even on

other channels. If the range check is successful, repeat it with

the motors running. There should be only a very slight

reduction in effective radio range with the motor turning.

If you are not sure about anything, please don’t risk a flight.

Send the whole system (including battery, switch harness and

servos) to the service department of your RC system

manufacturer and ask them to check it.

The first flight ...

Don’t try an unpowered test-glide with this model!

The model is designed for hand-launching, and should always

be launched exactly into any wind.

If you are a beginner to model flying we strongly

recommend that you ask an experienced model pilot to

help you for the first few flights.

Allow the model to climb to a safe height, then adjust the

trim sliders on the transmitter until the model flies in a

perfectly straight line “hands off”.

While the model is still at a safe altitude, switch off the motors

and try out the model’s controls on the glide. Carry out a “dry

run” landing approach at a safe height, so that you are

prepared for the real landing when the battery runs flat.

Don’t try any tight turns at first, and especially not on the

landing approach at low altitude. Leave the risky manoeuvres

until you are confident of the model’s handling. It is always

better to land safely at some distance from you, than to force

the model back to your feet and risk a heavy landing.

15. Safety

Safety is the First Commandment when flying any model

aircraft. Third party insurance should be considered a basic

essential. If you join a model club suitable cover will usually

be available through the organisation. It is your personal

responsibility to ensure that your insurance is adequate (i.e.

that it covers powered model aircraft).

Make it your job to keep your models and your radio control

system in perfect order at all times. Check the correct charging

procedure for the NC batteries used in your RC set. Make use

of all sensible safety systems and precautions which are

advised for your system. An excellent source of practical

accessories is the MULTIPLEX main catalogue, as our products

are designed and manufactured exclusively by practising

modellers for other practising modellers.

Always fly with a responsible attitude. You may think that

flying low over other people’s heads is proof of your piloting

skill; others know better. The real expert does not need to

prove himself in such childish ways. Let other pilots know

that this is what you think too. Always fly in such a way that

you do not endanger yourself or others. Bear in mind that

12

even the best RC system in the world is subject to outside

interference. No matter how many years of accident-free

flying you have under your belt, you have no idea what will

happen in the next minute.

We - the MULTIPLEX team - hope you have many hours of

pleasure building and flying your new model.

Klaus Michler

Parts list - Twin-Jet

Part No. Description Material Dimensions

No. off

01 1 Wing Particle foam Ready made

02 1 Fuselage nose Particle foam Ready made

03 1 Left fin Particle foam Ready made

04 1 Right fin Particle foam Ready made

05 1 Canopy Particle foam Ready made

06 1 Fuselage top decking Particle foam Ready made

10 1 Fuselage liner shell Vac. moulded plastic Ready made

15 1 Building instructions A4 format

16 1 Name placard decal set Printed film Ready made

20 1 Landing skid Balsa 10 x 10 x 800 mm

21 1 Cut from part 20

Canopy hook block Balsa 10 x 10 x 35 mm

22 2 Cut from part 20

lateral location Balsa 10 x 10 x 20 mm

Accessories

22 1 Screw-hook dowel Wood 10 Ø x 10 mm

23 3 Velcro tape, hook side Plastic 25 x 60 mm

24 3 Velcro tape, loop side Plastic 25 x 60 mm

25 2 Washer Metal M2

26 1 Allen key Metal 1.5 mm A/F

27 2 Pushrod connector grubscrew Metal M3

28 1 Rubber band Rubber 1 x 8 x 30

29 1 Rubber band Rubber 1 x 1 x 25

30 2 Pre-formed pushrod Metal Ready made, 1 mm Ø

31 3 Screw-hook Metal Ready made

32 2 Glue-fitting horn Plastic Ready made

33 2 Pushrod connector Metal Ready made

34 2 Nut Metal M2

Power system and small parts

35 2 Propeller Plastic 125 x 110 mm

36 2 Motor Permax 400 6V Ready made

37 1 Power cables, with connectors Ready made

38 2 Capacitor Ceramic / metal 47 nF

39 4 Insulating sleeve Plastic Ready made, 10 long

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MULTIPLEX Twinjet Owner's manual

MULTIPLEX Twinjet Owner's manual

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